/* ── Transitions ── */

.fade-in {
  animation: fadeIn var(--transition-slow) ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Panel content swap */
.panel-transition {
  transition: opacity var(--transition) ease;
}

.panel-transition.swapping {
  opacity: 0.3;
}

/* ── Success Animation ── */

.success-flash {
  animation: successFlash 0.6s ease forwards;
}

@keyframes successFlash {
  0% { background-color: inherit; }
  30% { background-color: var(--success-light); }
  100% { background-color: inherit; }
}

/* Checkmark pop */
.check-pop {
  animation: checkPop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes checkPop {
  from { transform: scale(0); }
  to { transform: scale(1); }
}

/* ── Loading States ── */

.skeleton {
  background: linear-gradient(
    90deg,
    var(--border-light) 25%,
    var(--border) 50%,
    var(--border-light) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Pulse for active loading step */
.pulse {
  animation: pulse 1.5s ease infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* ── Tab Transition ── */

.tab-content {
  transition: opacity var(--transition) ease;
}

.tab-content.entering {
  opacity: 0;
}

.tab-content.visible {
  opacity: 1;
}

/* ── Progress Bar Glow ── */

.progress-fill.celebrating {
  box-shadow: 0 0 8px var(--success);
  animation: progressGlow 1s ease forwards;
}

@keyframes progressGlow {
  0% { box-shadow: 0 0 8px var(--success); }
  100% { box-shadow: none; }
}

/* ── Button Feedback ── */

.btn-flash {
  animation: btnFlash 0.3s ease;
}

@keyframes btnFlash {
  50% { transform: scale(0.95); }
}

/* ── Concept transition ── */

.concept-enter {
  animation: conceptEnter var(--transition-slow) ease forwards;
}

@keyframes conceptEnter {
  from {
    opacity: 0;
    transform: translateX(8px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}